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In repairs above the waterline, gelcoat applied over properly prepared WEST SYSTEM epoxy has a great track record. If the hardener has not fully reacted with the epoxy resin or the amine blush is not removed from the cured surface, problems can occur. On-Line Differential Viscometer for Gel Permeation Chromatography with The ViscoStarWyatt Technologys ViscoStar III is an on-line differential viscometer that can be paired with the DAWN HELEOS II or miniDAWN TREOS multi-angle light scattering detectors to analyze intrinsic viscosity in combination with SEC-MALS-IV and SEC-MALS to determine the characterization of molar mass, size, branching ratio and conformation of proteins, peptides, biopolymers, and synthetic polymers. The nine-week exposure may not simulate what could happen after many years, but it does indicate that the gelcoat bond to epoxy laminates is a good bond and should perform well. The test included a variety of finishing processes. Epoxyworks 22 / Winter 2004. Two popular gelcoats were used, Minicraft and Evercoat. This laminate provided a stiff panel that simulated a patch used to repair the bottom of a fiberglass boat.
The first layer of the laminate is then applied to gelcoat, which has not completely cured. Conclusion The overall effect of moisture on the gelcoat's bond to both the polyester and epoxy panels was negligible. Boats that are dry sailed or trailered have also had good success with gelcoats on underwater epoxy repairs. In addition, we varied the length of time the epoxy was allowed to cure before being subjected to high moisture conditions. Since these three modes of failure occurred under similar loads, it indicates that the strength of the bond is close to the cohesive strength of both the gelcoat and the fairing compound. When a polyester boat is built, polyester gelcoat is first sprayed onto the mold surface. When the studs were pulled, the failures occurred in the fairing compound, cohesive failure of the gelcoat, or in the bond between the gelcoat and laminate.
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